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Tomato Catsup

This recipe uses saltpetre, which may pose food safety risks.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Cucumber and onion match in chemistry and in kitchens. They rank in the top 8% of all ingredient pairs, and cooks put them together in 6,050 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Tomato Catsup

Ingredients

Directions

  1. Pare and slice the cucumbers and onions.

  2. Spread them on a sieve over a large bowl.

  3. Strew a handful of coarse sea salt over them and let them stand for 24 hours.

  4. Collect the juice in the bowl and transfer it to a saucepan.

  5. Add the anchovies, white wine, whole mace, and black pepper to the saucepan.

  6. Simmer for 30 minutes, then strain the mixture.

  7. Let it cool, then bottle tightly for storage.

Recipe from a historical cookbook (Internet Archive).

Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.

  1. Cucumber + oniontop 8% of all pairs
    Smell alikestrong
    Cooked together6,050 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  2. Onion + peppertop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  3. Cucumber + peppertop 12% of all pairs
    Smell alikemoderate
    Cooked together5,991 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  4. Onion + white winetop 12% of all pairs
    Smell alikemoderate
    Cooked together4,535 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  5. White wine + peppertop 15% of all pairs
    Smell alikemoderate
    Cooked together5,433 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

Swap the mace

How well each one fits the dish's main ingredients (cucumber, onion, white wine, pepper):

  1. Garlicfits better
  2. Thymefits better
  3. Tarragonfits better
  4. Macethe original

Fit is the average pairing score against cucumber, onion, white wine, pepper. Candidates are from the same food group and used in at least 100 recipes.

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